Shock absorber



Nov. 25, 1930. G. BOEILLA SHOCK ABSORBER Filed July 11. 1928 2 Sheets-Sheet 1 Nov. 25, 1930- I e. BQELLA 1,

snocx ABSORBER Filed July 11, 1928 '2 Sheets-Sheet 2 Fig. 2

shown in Figures 3 and 4, respectively and as hereinafter explained,

Patented Nov. 25, 1930 'omrE-D STATES T -O CE i 1 GIOVANNI BOELLA, or roam, iTALY, ASSIGNOR T0 swa m amma DI vILLAa PERosA, or TURIN, ITALY i-SHLOCK nissonnian Q This invention has for its object improve ments in shock absorbers of the type comprising two arms pivoted together at one end like a compass and the other ends of which are connected by suitable means, one to the frame and the other to the axle or bridge of the vehicle, in which the action of absorbing shocks is eflected by friction surfaces in contact around the pivotal point of the arms.

the case of example,

I shock absorber made according to the present invention. or

provements consists essentially of friction surfaces formed of metallic discs connected alternately to one and to the other of the arms and enclosed in a box or case filled with grease or other suitable lubricant, and sufliciently tightly closed to prevent the escape of the lubricant and the penetration of dust and mud to the interior of the case.

The invention also includes the particular a, form of the heads of the arms COITQSPOIldlDg to the form of the discs to which the arms are connected as Well as to the means of connec-- tion employed; the form and construction of the means employed for inserting .4 the lubricant into the case and the means 'for] regulating the pressure between the discs. 1

- The shock absorber made accordin to the invention is strong, is easily adjustecfiworks efliciently and constantly,is'cheap and ,isnot influenced by any external substances.

The accompanying drawing shows, by way one form of construction of the Fig. 1 is a side elevation.

Fig. 2 is an enlarged section through the line 2-2of Fig. 1.

the two arms;

ofthe invention and may be of any suitable I land 2 indicate two metallic discs similar in form, but situated in a different manner, as

so that the discs 1 arefixcdto heads l of the arms 3 and the The arm 3 as Well asthe arm 4 are made from (in the example shown each group comprises a i the arm 4 construction as the heads 2 rotation formed inthe heads 2 heads 2 and discs 2 of the device the arms 3 applicatidfirlea July 11, 1928, Serial in); 291,974, and inItaIy'JuIy 14,1927.

two metal sheets havingthe outlines asindispaced farther apart from each other 1 than the arms 4:- The discs 1 and 2 are arranged According to the present invention the 1111- in a staggered relation and form-three groups three discs), of which twolateral groupsare comprised between the heads 1?? of the arms 3 and 2 oi the arms 4,"resp,ect1vely and one central set iscomprised between the heads 2a;

of the arms 4: i s

The heads 1 of the arm'3land those 2? of have the same form and details of the corresponding discs. 1,, 2 and only dilfer fromtheselatter: by theth'icki ness whichris greater in the discs 1,:

The discs lare connected to and the discs 2 connected to :theheads 2 by means of bolts 7-, "7 The .bolts :7 pass through holes Sin the heads l and discs 1' and the bolts: 75 pass throughholes 8" in i and discs 2,:the-holes 8 being displaced withrelation tolthe hole 8 as shown in Figsg3 and 4. Toperm it the relative of the heads and the discs secured thereto as above described, the heads l and discs 1 have sector shaped slots 19 formed therein which register with; the holes 8 have sector slots 9 displaced withrelation to the'slots V v 9 andregistering with the holes 8. F igs. 3 and 4 show separately side views of 1 It will thus be seen thatin the'operation beingsecured to the frame 0t thetvehicle and the arms. 4 to-the anle, the relative movements of they frame 3 and l aresi'n the; same plane,:whilst towards the other end a are spaced apart and'thearms "8 are the heads 1 and discs 2, and-the shapedu and axle Will cause a; relative 'movementof the arms and rotate the heads 1 and 2 with their respective discs 'in; opposite directions.

If thewarms 3 arevmovedmpward and,-th U a :further separal tionoftheends of the arms 3 andelthan is shownin Fig.1 1,,thefbolts'7 iwil'l be moved discs 2 are fixedto heads 2 of thearms 4. j

Fight and the boltq'f arms- 4; downward, causing armoveaownward i metrically opposed holes,

in the left hand slot 9, in said figure while the bolt 7 will move to the right in the upper slot shown in Fig. 3 and the bolt 7 will move to the left in the lower slot 9 in said figure. With the downward movement of the arms 3 and upward movement of the arms a the reverse movements of the bolts in the slots take place.

The movements of the arms in both directions is retarded by the friction of the plates 1 and 2. y

The heads of the arms and the corresponding discs are enclosed in a case comprising two caps 10 mounted on a cylindrical collar 11 upon the exterior of which fit the flanged edges of the caps (Fig. 2).

The collar 11 is made from a strip of sheet metal and has parts cut away and slots for the passage of the arms 3 and 4:.

The length of the collar 11 is slightly less than the thickness of the group of discs and heads of the arms so as to allow pressure to be exerted between the discs and heads through the two caps 10 of the case. For

this purpose there are provided two cup shaped springs 12 arranged externally against the caps 10, which may be compressed by tightening the central bolt 5, constituting the pivot of the two arms 3 and 4.

The bolt 5 is formed with an axial aperture 18 which starts at one end and extends across the whole width of the case. Through this aperture and radial apertures 1% communicating with the aperture 13 there may be introduced grease or other suitable lubricant into the interior of the case by means of a grease pump. The lubricant may thus be renewed in a quick and easy manner.

The discs and the heads of the arms are conveniently provided with holes 15 so as to facilitate the circulation of the lubricant.

What I claim is: V

A shock absorber comprising two end heads, each provided with two circular diatwo diametrically opposed sector-shaped slots situated at 90 with respect to said holes and a central hole, an arm connected with each of said heads and having its outer edge tangent to the corresponding head and the inner edge substantially in radial direction, two intermediate heads equally spaced from one another and from the end heads, arms connected with said intermediate heads and symmetrically arranged with respect to the arms of the end heads, the intermediate heads being provided with holes and diametrically opposed arcuate slots angularly displaced with respect to the hol-es and slots of the end heads, a set of disks arranged in the spaces between said heads and having holes and arena-ted slots registering with the holes and slots of the end heads, a second set of disks alternating with the disks of the first set and having holes and arcuated'slots registering with the holes and slots of the intermediate heads, pins located in the holes of one set and passing through the arcuated slots of the other set, a ring embracing the heads and disks and having slots through which said pins pass, removable covers to close the heads and disks in the ring and keep said pins in place, a central bolt to secure the covers in place and elastic members interposed between the covers and the head and nut of said bolt.

In testimony that 1 claim the foregoing as my invention, I have signed my name.

GIOVANNI BOELLA. 

